Non-chlorinated brake cleaner and Breakfree CLP. I use CLP on everything and the brake cleaner on my barrels and BCG.
As for me I am a fan of Butch's Bore Shine and Breakfree CLP.
Butch's does a great job on carbon and a good job with copper. It claims it removes lead too but I really can't say whether it does or not as I don't shoot much lead.
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